Steam Community Market enables buying and selling with Steam Wallet
The Steam Community Market, currently in beta with Team Fortress 2, is designed to allow members to buy and sell items using their Steam Wallet funds. This is an expansion of Steam's previous trading policy and its surprisingly complex TF2 economy. The beta is only available for TF2 at the moment, but more games will be added in the new year.

"With over a half million trades made every week, the trading system has been very successful," Valve's Tony Paloma says. "Extending game economies beyond trades and giving players a way to turn gameplay into funds for new items and games is a key component for moving that success forward."

All consumable TF2 goods and tools are up for selling and purchasing, including paints, keys and crates; all compatible items are now labeled as "Marketable" in Steam inventories. During the beta, Steam takes 5 percent of each transaction amount to cover the cost of development and to prevent fraud. for more in-depth questions, consult the Steam Community Market FAQ or the discussion group.

But before you go asking, yes, this does mean that playing TF2 is a more legitimate career move than ever before.
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Steam Community Market Now In Beta
Service Expansion Allows Players to Buy and Sell In-Game Items Via Steam

December 12, 2012 -- Valve, creators of best-selling game franchises (such as Counter-Strike, Half-Life, Left 4 Dead, Portal, and Team Fortress) and leading technologies (such as Steam and Source), today introduced the Steam Community Market, now in Beta with Team Fortress 2.
The Community Market is designed to expand the Steam Economy beyond trading. Players are now enabled to buy and sell in-game items with other players for Steam Wallet funds.

"With over a half million trades made every week, the trading system has been very successful," said Tony Paloma of Valve. "Extending game economies beyond trades and giving players a way to turn gameplay into funds for new items and games is a key component for moving that success forward."

The Steam Community Market, now in beta with Valve's Team Fortress 2, will be available to other titles on Steam in the New Year. Games that participate enable users to show off their items on the Steam Community and sell or trade their items to others.
Items purchased are subject to transaction fees, please see FAQ for more http://www.steamcommunity.com/market/faq

This article was originally published on Joystiq.